using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Session ses = new Session();
        public Form1()
        {
            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)
        {
            Form faux = new Form();
            TextBox tex = new TextBox();
            tex.Text="0";
            faux.Controls.Add(tex);
            ses.controles.Add(tex);
            faux.Show();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < ses.controles.Count; i++)
            {
                ses.controles[i].Text = ses.controles[i].Text + "<X>";
            }
        }

    }

    public class Session
    {
        public List<Control> controles{get;set;}
        public Session()
        {
            controles = new List<Control>();
        }
    }
}